题解 | #分组计算练习题#
分组计算练习题
https://www.nowcoder.com/practice/009d8067d2df47fea429afe2e7b9de45
select gender, university, COUNT(id) user_num, avg(active_days_within_30) avg_active_day, avg(question_cnt) avg_question_cnt from user_profile group by university, gender;
那就小心你的腰子咯